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Default Proton NMR assignments of heme contacts and catalytically implicated amino acids in c

Proton NMR assignments of heme contacts and catalytically implicated amino acids in cyanide-ligated cytochrome c peroxidase determined from one- and two-dimensional nuclear Overhauser effects.

Related Articles Proton NMR assignments of heme contacts and catalytically implicated amino acids in cyanide-ligated cytochrome c peroxidase determined from one- and two-dimensional nuclear Overhauser effects.

Biochemistry. 1991 May 7;30(18):4398-405

Authors: Satterlee JD, Erman JE

Proton NMR assignments of the heme pocket and catalytically relevant amino acid protons have been accomplished for cyanide-ligated yeast cytochrome c peroxidase. This form of the protein, while not enzymatically active itself, is the best model available (that displays a resolvable proton NMR spectrum) for the six-coordinate low-spin active intermediates, compounds I and II. The assignments were made with a combination of one- and two-dimensional nuclear Overhauser effect methods and demonstrate the utility of NOESY experiments for paramagnetic proteins of relatively large size (Mr 34,000). Assignments of both isotope exchangeable and nonexchangeable proton resonances were obtained by using enzyme preparations in both 90% H2O/10% D2O and, separately, in 99.9% D2O solvent systems. Complete resonance assignments have been achieved for the proximal histidine, His-175, and His-52, which is a member of the catalytic triad on the distal side of the heme. In addition, partial assignments are reported for Trp-51 and Arg-48, catalytically important residues, both on the distal side. Aside from His-175, partial assignments for amino acids on the proximal side of the heme are proposed for the alanines at primary sequence positions 174 and 176 and for Thr-180 and Leu-232.

PMID: 1850622 [PubMed - indexed for MEDLINE]



Source: PubMed
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